The building, which is accessed via Sutherland Road, was evacuated and a number of emergency service vehicles were seen outside, including gas technicians from SGN, and Kent Fire and Rescue, on the day they were found.

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SGN said at the time that engineers had tested for the presence of natural gas and carbon monoxide, but "there were no traces of either".

Police deemed the deaths non-suspicious.

But their discovery caused further suspicions after it emerged a 51-year-old man had been found dead in the same building in July 2012.

Gas technicians outside the flat just off Grove Hill Road, December 6, 2017

A post mortem examination has determined the cause of Mr Carr and Mr Millivoy's death to be cirrhosis of the liver.

Milivoy Webber, 50

Senior coroner Roger Hatch said: "There was no inquest in respect of either death as a post mortem was carried out and both gentleman died from natural causes."

Nathan Carr's father Peter, posted a tribute to his son on Facebook, saying "he was a lovely child" and that "he brought a lot of happiness into many people’s lives, and I am very proud that he was my son".

Nathan Carr, 41

A cremation ceremony for Nathan was held on January 5, 2018 in Putney, south London.

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Liver disease causes about 8,500 premature deaths a year in England, which is about 0.0183 per cent of deaths in England annually.

Liver specialist comment

Liver specialist Dr William Alazawi at BMI The Sloane Hospital in Beckenham, who was not involved in this case, said: "Cirrhosis is a long term condition. Cirrhosis of the liver means scarring of the liver.

"An affected liver looks hard and nobbly.

"But even at that stage a patient can be entirely asymptomatic."

He said the disease can then start to affect the patient in a number of ways but ultimately "the liver starts to fail".

"There is no set time limit. It can be rapid - days and weeks."

He said cirrhosis of the liver can be caused by a number of factors, including damage caused by lifestyle which scars the liver over time, or by other diseases.

Dr Alazawi said he could not comment on this particular case.

He said: "The sad fact is that lots of people do die of cirrhosis of the liver a year," and he urged people who are worried about their liver to speak with their GP.

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